Correct Answer - Option 4 : nature of the wire material
The correct answer is option 4) i.e. nature of the wire material
CONCEPT:
-
Resistance: The hindrance to the flow of current offered by a material is called electrical resistance.
- The SI unit of electrical resistance is ohm (Ω). The resistance of a conducting wire is given by the equation:
\(R = ρ\frac{l}{A}\)
Where R is the resistance, l is the length of the wire and A is the cross-sectional area of the material.
- The resistivity of a material is defined as the resistance offered by a material of unit cross-sectional area and unit length.
- Resistivity is an intrinsic property i.e. it is the same for a given type of material.
EXPLANATION:
- The resistivity of any wire is its intrinsic property.
-
Resistivity is the reciprocal of conductivity of the material. The conductivity of a material depends on the density of free electrons present in them.
- The density of free electrons is different for different types of materials.
- Thus, resistivity depends on the nature of the wire material.
